diff --git a/package.json b/package.json
index 1d7cf770d3..2d0f044694 100644
--- a/package.json
+++ b/package.json
@@ -155,6 +155,7 @@
           "src/components/refreshdialog/refreshdialog.js",
           "src/components/sanatizefilename.js",
           "src/components/scrollManager.js",
+          "src/plugins/experimentalWarnings/plugin.js",
           "src/plugins/htmlVideoPlayer/plugin.js",
           "src/components/search/searchfields.js",
           "src/components/search/searchresults.js",
diff --git a/src/plugins/experimentalWarnings/plugin.js b/src/plugins/experimentalWarnings/plugin.js
index c39612d45b..7450040541 100644
--- a/src/plugins/experimentalWarnings/plugin.js
+++ b/src/plugins/experimentalWarnings/plugin.js
@@ -1,59 +1,63 @@
-define(['connectionManager', 'globalize', 'userSettings', 'apphost'], function (connectionManager, globalize, userSettings, appHost) {
-    'use strict';
+import globalize from 'globalize';
+import * as userSettings from 'userSettings';
+import appHost from 'apphost';
 
-    // TODO: Replace with date-fns
-    // https://stackoverflow.com/questions/6117814/get-week-of-year-in-javascript-like-in-php
-    function getWeek(date) {
-        var d = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()));
-        var dayNum = d.getUTCDay() || 7;
-        d.setUTCDate(d.getUTCDate() + 4 - dayNum);
-        var yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
-        return Math.ceil((((d - yearStart) / 86400000) + 1) / 7);
+/*eslint prefer-const: "error"*/
+
+// TODO: Replace with date-fns
+// https://stackoverflow.com/questions/6117814/get-week-of-year-in-javascript-like-in-php
+function getWeek(date) {
+    const d = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()));
+    const dayNum = d.getUTCDay() || 7;
+    d.setUTCDate(d.getUTCDate() + 4 - dayNum);
+    const yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
+    return Math.ceil((((d - yearStart) / 86400000) + 1) / 7);
+}
+
+function showMessage(text, userSettingsKey, appHostFeature) {
+    if (appHost.supports(appHostFeature)) {
+        return Promise.resolve();
     }
 
-    function showMessage(text, userSettingsKey, appHostFeature) {
-        if (appHost.supports(appHostFeature)) {
-            return Promise.resolve();
-        }
+    const now = new Date();
 
-        var now = new Date();
+    // TODO: Use date-fns
+    userSettingsKey += now.getFullYear() + '-w' + getWeek(now);
 
-        // TODO: Use date-fns
-        userSettingsKey += now.getFullYear() + '-w' + getWeek(now);
+    if (userSettings.get(userSettingsKey, false) === '1') {
+        return Promise.resolve();
+    }
 
-        if (userSettings.get(userSettingsKey, false) === '1') {
-            return Promise.resolve();
-        }
+    return new Promise(function (resolve, reject) {
+        userSettings.set(userSettingsKey, '1', false);
 
-        return new Promise(function (resolve, reject) {
-            userSettings.set(userSettingsKey, '1', false);
-
-            require(['alert'], function (alert) {
-                return alert(text).then(resolve, resolve);
-            });
+        import('alert').then(({default: alert}) => {
+            return alert(text).then(resolve, resolve);
         });
-    }
+    });
+}
 
-    function showBlurayMessage() {
-        return showMessage(globalize.translate('UnsupportedPlayback'), 'blurayexpirementalinfo', 'nativeblurayplayback');
-    }
+function showBlurayMessage() {
+    return showMessage(globalize.translate('UnsupportedPlayback'), 'blurayexpirementalinfo', 'nativeblurayplayback');
+}
 
-    function showDvdMessage() {
-        return showMessage(globalize.translate('UnsupportedPlayback'), 'dvdexpirementalinfo', 'nativedvdplayback');
-    }
+function showDvdMessage() {
+    return showMessage(globalize.translate('UnsupportedPlayback'), 'dvdexpirementalinfo', 'nativedvdplayback');
+}
 
-    function showIsoMessage() {
-        return showMessage(globalize.translate('UnsupportedPlayback'), 'isoexpirementalinfo', 'nativeisoplayback');
-    }
+function showIsoMessage() {
+    return showMessage(globalize.translate('UnsupportedPlayback'), 'isoexpirementalinfo', 'nativeisoplayback');
+}
 
-    function ExpirementalPlaybackWarnings() {
+class ExpirementalPlaybackWarnings {
+    constructor() {
         this.name = 'Experimental playback warnings';
         this.type = 'preplayintercept';
         this.id = 'expirementalplaybackwarnings';
     }
 
-    ExpirementalPlaybackWarnings.prototype.intercept = function (options) {
-        var item = options.item;
+    intercept(options) {
+        const item = options.item;
         if (!item) {
             return Promise.resolve();
         }
@@ -71,7 +75,7 @@ define(['connectionManager', 'globalize', 'userSettings', 'apphost'], function (
         }
 
         return Promise.resolve();
-    };
+    }
+}
 
-    return ExpirementalPlaybackWarnings;
-});
+export default ExpirementalPlaybackWarnings;